XML 48 R32.htm IDEA: XBRL DOCUMENT v3.20.1
Revenue - (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
CONCENTRATION      
Allowance for doubtful accounts $ 3,500   $ 3,900
Change in estimate of uncollectible (percent) 0.50%    
Change in revenue recognized due to 0.5% change in uncollectible percentage $ 500    
Increase (decrease) to revenues 26,678 $ 21,810  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606      
CONCENTRATION      
Increase (decrease) to revenues $ 1,207 $ (37)